Common symptoms of dehydration during exercise include dry mouth, dizziness, fatigue, and decreased performance. As the body loses water and electrolytes through sweat, individuals may also experience increased heart rate and muscle cramps. Adequate hydration is crucial to prevent these symptoms, especially in hot or humid conditions. Regularly monitoring fluid intake before, during, and after workouts can help maintain performance and overall health. Recognizing early symptoms of dehydration and addressing them promptly is essential for safe and effective exercise.